<template>
  <div>
    <h2>当前求和为：{{$store.state.sum}}</h2>
    <select v-model.number="n">
      <option value="1">1</option>
      <option value="2">2</option>
      <option value="3">3</option>
    </select>
    <button @click="increment">+</button>
    <button @click="decrement">-</button>
    <button @click="incrementOdd">当前求和为奇数再加</button>
    <button @click="incrementWait">等一等再加</button>
  </div>
</template>

<script>
  export default {
    name: "Count",
    data() {
      return {
        n: 1, // 用户选择的数字
      };
    },
    methods: {
      increment() {
        // Vue.$store.state.sum 存在状态（数据）
        this.$store.commit('JIA',this.n)
      },
      decrement() {
        this.$store.commit('JIAN',this.n)
      },
      incrementOdd() {
         this.$store.dispatch('jiaOdd',this.n)
      },
      incrementWait() {
         this.$store.dispatch('jiaWait',this.n)
      },
    },
  };
</script>

<style>
    button {
        margin-left: 5px;
    }
</style>